"Frost nova" Particle Animation -- HOW??

Hi guys.

I had no idea where else to post this question, so I went on and posted it here.

Anyway, my question is about Frost Nova particle system animation.

I'm creating a game, where when a player walks into a trigger, a frost Nova particle system animation should be played.

But how would I create such a nova?? I tried using the Particle System inside Unity, but I couldn't seem to get the
effect that I wanted.

Anyone ever tried making one, and might be able to help me?

Thanks in advance!